Annual report [Section 13 and 15(d), not S-K Item 405]

LOANS HELD FOR INVESTMENT AND ALLOWANCE FOR CREDIT LOSSES (Amortized Cost Basis of Collateral-Dependent Loans) (Details)

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LOANS HELD FOR INVESTMENT AND ALLOWANCE FOR CREDIT LOSSES (Amortized Cost Basis of Collateral-Dependent Loans) (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross $ 2,651,550 $ 2,733,918
Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 3,600 3,300
Real estate secured [Member] | Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 3,554 3,277
Non real estate secured [Member] | Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 94 30
Commercial, Financial, Agricultural [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 189,208 225,190
Commercial, Financial, Agricultural [Member] | Real estate secured [Member] | Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 0 0
Commercial, Financial, Agricultural [Member] | Non real estate secured [Member] | Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 39 30
Real Estate - Construction [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 219,994 196,091
Real Estate - Construction [Member] | Real estate secured [Member] | Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 0 275
Real Estate - Construction [Member] | Non real estate secured [Member] | Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 0 0
Real Estate - Commercial Mortgage [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 779,095 825,456
Real Estate - Commercial Mortgage [Member] | Real estate secured [Member] | Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 427 1,296
Real Estate - Commercial Mortgage [Member] | Non real estate secured [Member] | Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 0 0
Real Estate - Residential [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 1,042,504 1,004,219
Real Estate - Residential [Member] | Real estate secured [Member] | Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 2,476 1,706
Real Estate - Residential [Member] | Non real estate secured [Member] | Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 0 0
Real Estate - Home Equity [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 220,064 210,920
Real Estate - Home Equity [Member] | Real estate secured [Member] | Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 651 0
Real Estate - Home Equity [Member] | Non real estate secured [Member] | Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 0 0
Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 200,685 272,042
Consumer [Member] | Real estate secured [Member] | Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross 0 0
Consumer [Member] | Non real estate secured [Member] | Asset Pledged As Collateral [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Notes Receivable Gross $ 55 $ 0